smbnetfs: fix build

srcpkgs/smbnetfs/patches/xattr.patch

@@ -0,0 +1,11 @@
+--- src/function.c
++++ src/function.c
+@@ -8,7 +8,7 @@
+ #include <dirent.h>
+ #include <sys/statvfs.h>
+ #include <sys/types.h>
+-#include <attr/xattr.h>
++#include <sys/xattr.h>
+ #include <time.h>
+ #include <pthread.h>
+ #include <libsmbclient.h>